30 June 2021 Measuring OAM by the hybrid scheme of interference and convolutional neural network
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Abstract

The atmospheric turbulence can cause wavefront distortion when vortex beam carrying orbital angular momentum (OAM) propagates in free space. This brings challenges to the recognition of OAM modes. To realize effective recognition of multichannel vortex beams in atmospheric turbulence, a hybrid interference-convolutional neural network (CNN) scheme is proposed. Here, we compare two different approaches to identify the topological charges under different turbulence levels: the first is based on CNN only and the second is the hybrid scheme of interference and CNN. The simulation shows that the recognition performance of multiple vortex beams under different turbulence levels is improved by our hybrid scheme. Compared with the traditional CNN-based method, the interference-CNN scheme can further identify the sign of topological charge. Moreover, we generalize its feasibility through different kinds of vortex beams with a radial index of p  ≠  0. This provides a versatile tool for large-capacity optical communication based on OAM modes.

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2021/$28.00 © 2021 SPIE
Xin Fu, Yihua Bai, and Yuanjie Yang "Measuring OAM by the hybrid scheme of interference and convolutional neural network," Optical Engineering 60(6), 064109 (30 June 2021). https://doi.org/10.1117/1.OE.60.6.064109
Received: 8 April 2021; Accepted: 16 June 2021; Published: 30 June 2021
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CITATIONS
Cited by 10 scholarly publications.
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KEYWORDS
Atmospheric turbulence

Turbulence

Convolutional neural networks

Convolution

Optical communications

Atmospheric propagation

Optical engineering

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